* {
    margin: 0;
}

body {
    background-color: rgb(45, 111, 161);
    display: flex;
    justify-content: center;
    align-items: center;
    /*    对body设置高度应该是可视高度 v-view*/
    height: 100vh;
    min-width: 1000px;
    color: white;
}

.width-500 {
    width: 500px;

}

.width-60 {
    width: 60px;
}

.width-300 {
    width: 300px;

}

.width-200 {
    width: 200px;

}

.height-200 {
    height: 200px;
}

.border-red {
    border: 1px solid red;
}

.display-flex {
    display: flex;
}

.align-items-center {
    display: flex;
    align-items: center;
}

.justify-content-between {
    display: flex;
    justify-content: space-between;
}

.justify-content-center {
    display: flex;
    justify-content: center;
}

/*子代选择器*/
.houtai > div:nth-child(1) {
    color: #d9e016;
}

.houtai > div {
    width: 50px;
    height: 25px;
    /*display: flex;*/
    /*justify-content: space-between;*/
    text-align: justify;
    margin: 0 20px 0 0;
}

.houtai > div::after {
    content: "";
    display: inline-block;
    width: 100%;
}

form {
    margin: 10px 0;
}

form > div:nth-child(1) {
    background-color: rgb(105, 170, 218);
    height: 120px;
    border-radius: 5px;
    padding: 5px;
}

/*form > div:nth-child(1) > div > div:nth-child(1) {*/
/*    text-align: right;*/
/*}*/
form > div:nth-child(1) > div {
    /*上下   左右*/
    margin: 10px 0;
}

.text-align-right {
    text-align: right;
}

input[type=text] {
    height: 25px;
    margin-left: 10px;
    background-color: rgb(250, 255, 189);
    border: none;
}

input[type=submit] {
    background-color: rgb(170, 206, 233);
    border-radius: 5px;
    padding: 10px 50px;
    border: none;
    margin: 10px;
    color: white;
    font-family: 楷体;
    font-size: 30px;
}